Polyester fibre

The group of polyester fibres represents the largest proportion of synthetically produced fibres worldwide. Although many different polymers can be assigned to this group, polyethylene terephthalate (PET) is by far the largest part of this group. As the name suggests, polyesters are formed by polycondensation of carboxylic acid derivatives and alcohols to form ester groups. The great success of polyester fibres is due to their very good processability, excellent tailor-made properties and the low material price.  Fibre properties, such as thermal and dimensional stability, and the mechanical properties can be very well controlled by the crystal formation during fibre production. The fibres are primarily produced using the melt spinning process.

Pros and cons
Polyester fibre Properties


  • Low density (specific weight)
  • High toughness and therefore excellent resistance to crack propagation
  • Good chemical resistance to solvents and lubricants as well as weak acids and alkalis
  • Favourable biological resistance
  • Excellent UV resistance
  • Good heat resistance


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Polyester fibre
Manufacturing process

As already explained above, polyesters are formed by polymerisation (or, more precisely, polycondensation) between carboxylic acid derivatives and alcohols. In the case of PET which is produced in high quantity, these are terephthalic acid and ethylene glycol. The water formed during the reaction must be removed to achieve high molecular weights and thus satisfactory product properties. The fibres are produced in a further step by means of a melt spinning process. Filaments are formed with the aid of a spinneret, which can then be processed directly into fibres.

Polyester fibre Programme

Fibre Filler



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Order our Polyester fibre Sample box

Contact our fibre experts and discover our extensive STW sample box with numerous raw material samples, personally tailored to your needs and requirements.

Order Polyester fibre sample box

technology and
quality of the fibre

State-of-the-art laboratory facilities, quality management according to ISO 9001:2015, energy management according to ISO 50001:2018 and last but not least the high demands on our own work ensure the high quality standards of our Polyester fibre. See for yourself.

If you want to know more about the technology and quality of our Polyester fibre If you want to know, just get in touch with us. We would be happy to advise you comprehensively and help you with our know-how.

You are looking for the perfect Polyester fibre for your application or have an exact requirement profile, which the used Polyester fibre must fulfill?

Then you are exactly right, as a technology leader in the field of fibre development and production, we offer you individual solutions and manufacturing processes that ensure constant and reproducible fibre quality.



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